n.1 the act or an instance of inserting.
2 an amendment etc. inserted in writing or printing.
3 each appearance of an advertisement in a newspaper etc.
4 an ornamental section of needlework inserted into plain material (lace insertions).
5 the manner or place of attachment of a muscle, an organ, etc.
6 the placing of a spacecraft in an orbit.
Etymology: LL insertio (as INSERT)